Bird cage



FIG. 1 is a perspective view of a bird cage showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a right side elevational view thereof, the left side being amirror image of the right side shown;

FIG. 5 is a front elevational view thereof; and

FIG. 6 is a rear elevational view thereof.

The ornamental design of a bird cage, substantially as shown anddescribed.